Add tests for package compilation with images

pkg/compiler/artifact_test.go

@@ -0,0 +1,140 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package compiler_test
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	. "github.com/mudler/luet/pkg/compiler/backend"
+
+	. "github.com/mudler/luet/pkg/compiler"
+	helpers "github.com/mudler/luet/pkg/helpers"
+	pkg "github.com/mudler/luet/pkg/package"
+	"github.com/mudler/luet/pkg/tree"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Artifact", func() {
+	Context("Simple package build definition", func() {
+		It("Generates a delta", func() {
+
+			generalRecipe := tree.NewGeneralRecipe()
+
+			err := generalRecipe.Load("../../tests/fixtures/buildtree")
+			Expect(err).ToNot(HaveOccurred())
+			Expect(generalRecipe.Tree()).ToNot(BeNil()) // It should be populated back at this point
+
+			Expect(len(generalRecipe.Tree().GetPackageSet().GetPackages())).To(Equal(1))
+
+			compiler := NewLuetCompiler(nil, generalRecipe.Tree())
+			spec, err := compiler.FromPackage(&pkg.DefaultPackage{Name: "enman", Category: "app-admin", Version: "1.4.0"})
+			Expect(err).ToNot(HaveOccurred())
+
+			lspec, ok := spec.(*LuetCompilationSpec)
+			Expect(ok).To(BeTrue())
+
+			Expect(lspec.Steps).To(Equal([]string{"echo foo > /test", "echo bar > /test2"}))
+			Expect(lspec.Image).To(Equal("luet/base"))
+			Expect(lspec.Seed).To(Equal("alpine"))
+			tmpdir, err := ioutil.TempDir(os.TempDir(), "tree")
+			Expect(err).ToNot(HaveOccurred())
+			defer os.RemoveAll(tmpdir) // clean up
+
+			tmpdir2, err := ioutil.TempDir(os.TempDir(), "tree2")
+			Expect(err).ToNot(HaveOccurred())
+			defer os.RemoveAll(tmpdir2) // clean up
+
+			unpacked, err := ioutil.TempDir(os.TempDir(), "unpacked")
+			Expect(err).ToNot(HaveOccurred())
+			defer os.RemoveAll(unpacked) // clean up
+
+			rootfs, err := ioutil.TempDir(os.TempDir(), "rootfs")
+			Expect(err).ToNot(HaveOccurred())
+			defer os.RemoveAll(rootfs) // clean up
+
+			err = lspec.WriteBuildImageDefinition(filepath.Join(tmpdir, "Dockerfile"))
+			Expect(err).ToNot(HaveOccurred())
+			dockerfile, err := helpers.Read(filepath.Join(tmpdir, "Dockerfile"))
+			Expect(err).ToNot(HaveOccurred())
+			Expect(dockerfile).To(Equal(`
+FROM alpine
+COPY . /luetbuild
+WORKDIR /luetbuild
+`))
+			b := NewSimpleDockerBackend()
+			opts := CompilerBackendOptions{
+				ImageName:      "luet/base",
+				SourcePath:     tmpdir,
+				DockerFileName: "Dockerfile",
+				Destination:    filepath.Join(tmpdir2, "output1.tar"),
+			}
+			Expect(b.ImageDefinitionToTar(opts)).ToNot(HaveOccurred())
+			Expect(helpers.Exists(filepath.Join(tmpdir2, "output1.tar"))).To(BeTrue())
+			Expect(b.BuildImage(opts)).ToNot(HaveOccurred())
+
+			err = lspec.WriteStepImageDefinition(lspec.Image, filepath.Join(tmpdir, "LuetDockerfile"))
+			Expect(err).ToNot(HaveOccurred())
+			dockerfile, err = helpers.Read(filepath.Join(tmpdir, "LuetDockerfile"))
+			Expect(err).ToNot(HaveOccurred())
+			Expect(dockerfile).To(Equal(`
+FROM luet/base
+RUN echo foo > /test
+RUN echo bar > /test2`))
+			opts = CompilerBackendOptions{
+				ImageName:      "test",
+				SourcePath:     tmpdir,
+				DockerFileName: "LuetDockerfile",
+				Destination:    filepath.Join(tmpdir, "output2.tar"),
+			}
+			Expect(b.ImageDefinitionToTar(opts)).ToNot(HaveOccurred())
+			Expect(helpers.Exists(filepath.Join(tmpdir, "output2.tar"))).To(BeTrue())
+			diffs, err := b.Changes(filepath.Join(tmpdir2, "output1.tar"), filepath.Join(tmpdir, "output2.tar"))
+			Expect(err).ToNot(HaveOccurred())
+
+			Expect(diffs).To(Equal(
+				[]ArtifactLayer{{
+					FromImage: filepath.Join(tmpdir2, "output1.tar"),
+					ToImage:   filepath.Join(tmpdir, "output2.tar"),
+					Diffs: ArtifactDiffs{
+						Additions: []ArtifactNode{
+							{Name: "/test", Size: 4},
+							{Name: "/test2", Size: 4},
+						},
+					},
+				}}))
+			err = b.ExtractRootfs(CompilerBackendOptions{SourcePath: filepath.Join(tmpdir, "output2.tar"), Destination: rootfs}, false)
+			Expect(err).ToNot(HaveOccurred())
+
+			artifact, err := ExtractArtifactFromDelta(rootfs, filepath.Join(tmpdir, "package.tar"), diffs, 2, false)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(helpers.Exists(filepath.Join(tmpdir, "package.tar"))).To(BeTrue())
+			err = helpers.Untar(artifact.GetPath(), unpacked, false)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(helpers.Exists(filepath.Join(unpacked, "test"))).To(BeTrue())
+			Expect(helpers.Exists(filepath.Join(unpacked, "test2"))).To(BeTrue())
+			content1, err := helpers.Read(filepath.Join(unpacked, "test"))
+			Expect(err).ToNot(HaveOccurred())
+			Expect(content1).To(Equal("foo\n"))
+			content2, err := helpers.Read(filepath.Join(unpacked, "test2"))
+			Expect(err).ToNot(HaveOccurred())
+			Expect(content2).To(Equal("bar\n"))
+		})
+
+	})
+})